A word of caution when using C&L. I speak from experience. I had a 73mm with the stock air box, (like C&L recommends). It worked great with the 19# cal. and mostly stock setup. Switched to 24# with a few more mods, (heads ans intake), and started to get a little bit of a surge. I installed a TFS stage 1 cam along with some 30# ers, and the C&L could not handle it. I switched back to the stock injectors and MAF to see it that helped, and it ran perfect, no surging or stalling. My Pro-M 80mm cal. for 30# should be here Tuesday. Just my .02.